A phonological reconstruction of Proto Central North Bahnaric

From the introduction: Because of unresolved phonological problems in Sedang phonemics (Smith, 1967a) and the need to clarify them before literacy materials could be prepared, the author undertook a study of Sedang dialects (1967b, 1967c). Though the phonological problems were resolved in this latter study, other problems became evident in the relations between Kontum languages. The present study was undertaken in an attempt to understand more fully the relationships between these languages. The study also complements similar studies in other areas of Viet Nam; namely: Proto-East-Katuic (D. M. Thomas, 1967), Proto-Mnong (Blood, 1966); and Proto-Chamic, a Malayo-Polynesian language (Lee, 1966)

Propulsion Risk Reduction Activities for Non-Toxic Cryogenic Propulsion

The Propulsion and Cryogenics Advanced Development (PCAD) Project s primary objective is to develop propulsion system technologies for non-toxic or "green" propellants. The PCAD project focuses on the development of non-toxic propulsion technologies needed to provide necessary data and relevant experience to support informed decisions on implementation of non-toxic propellants for space missions. Implementation of non-toxic propellants in high performance propulsion systems offers NASA an opportunity to consider other options than current hypergolic propellants. The PCAD Project is emphasizing technology efforts in reaction control system (RCS) thruster designs, ascent main engines (AME), and descent main engines (DME). PCAD has a series of tasks and contracts to conduct risk reduction and/or retirement activities to demonstrate that non-toxic cryogenic propellants can be a feasible option for space missions. Work has focused on 1) reducing the risk of liquid oxygen/liquid methane ignition, demonstrating the key enabling technologies, and validating performance levels for reaction control engines for use on descent and ascent stages; 2) demonstrating the key enabling technologies and validating performance levels for liquid oxygen/liquid methane ascent engines; and 3) demonstrating the key enabling technologies and validating performance levels for deep throttling liquid oxygen/liquid hydrogen descent engines. The progress of these risk reduction and/or retirement activities will be presented